Kazue akashi



KAZUE AKASHI, or TOKYO, JAPAN.

SO.LID INK.

1,325, 7 I Specification of Letters Patent. No Drawing.

To all whom it may concern:

Be it known that I, IKAZUEAKASHI a subject of the Emperor of Japan,residing at No. 2 Shichikencho, Asakusaku, Tokyo, J apan, haveinvented'certain new and useful Improvements in Solid Ink, of whichthe'following is a specification.

The present invention relates to a solid ink made of a mixture of asuitable dye with dextrin, soluble gum tragacanth, thymol and lacticacid, thev mixture being sufiiciently kneaded together by the additionof a small quantity of water so as to produce a plastic j or pastysubstance. The percentage of each 'ofthese raw materials may of coursebe varied according to the kind of dye em: ployed, but generally thefollowing will give good result for the purpose:

Dye 25 Dextrin Gum 'tragacanth Thymol Lactic acid .i

Methylene blue 25' Dextrin 5 Gum tragacanth L Thymol 2 Lactic acid 3 Iam aware of the so-called solid ink pa rts we ght.

made of a mixture of dye with dextrin, gum

tragacanth and a suitable antiseptic agent.

The dextrin' and gum tragacanth are'usedfor the purpose ofsolidifyingthe product and adjusting the-adhesive andcoatin sub stanceand also the brilliancy of the co or of the ink made thereof. But such aknown I ink cannot be stored for long time without being driedup, andbecomes very hard and my :hand in soluble only with 'difiiculty. On thecontrary, the solid ink made according to this invention ischaracterized by the fact that it contains thymol and lactic acid, anddoes not dry up-to an undesired extent.

Thymol, when used without'lactic acid, is not soluble in water, but whenused with the acid, this can dissolve in water very easily.

Therefore the solid or plastic ink made of the kneaded mixture of thesaid constitu- I ents can dissolve in water very easily, and does notprecipitate nor change color at all. Thymol serves very efliciently toprevent the product drying up or absorbing moisture so that it .canretain a proper hardness permanently. Moreover, lactic acid, besidesserving as an antiseptic, will also coact with thymol for the prescribedpurpose. Therefore while the mass of this ink may become hard at theouter surface when stored for years, theinner part thereof retains apasty or plastic condition and never gets too dry nor becomes hard. Whenput into water, this gives at once a liquid ink clearly coloredcorresponding to the coloring matter employed. Briefly the solid i'nkaccording to this invention has special merits of being safely storedpermanently in a pasty or .plastlc state or in proper hardness withoutiquescing or the like.

I claim: A solid ink containing as its essential constituents, a solubledye, togetherwith dextrin, acid, by the addition of a small quantity ofwater.

In testimony. whereof I have hereunto set presence of two subscribing"gum -.tragacanth, gthymol and lactic t e witnesses.-

Witnesses:

SUGAO Sosa, I Gem: KU'RIBARA. 1

mixture being rendered kneadable KAZUE AKASHI.

v Patented Dec. 23, 11919. Application filed November 14, 1917. SerialNo. 201,994. I I

